Journal of Magnetism and Magnetic Materials 272, E839 (2004)
Proceedings of the International Conference on Magnetism (ICM 2003)

R. Höhne, K. -H. Han, P. Esquinazi, A. Setzer, H. Semmelhack, D. Spemann and T. Butz

Abstract

We have studied the magnetization of disordered, pure carbon films in order to search for signs of para-, ferro-or antiferromagnetism. Carbon films on silicon substrates were produced by pulsed laser deposition in high vacuum and at room temperature using pressed ultra-clean graphite powder as target. The magnetization shows a Curie–Weiss behaviour added to a temperature-independent term. Annealing the films at 1000°C and in high-vacuum eliminates completely the Curie–Weiss contribution. We compare our results with those recently obtained in activated carbon fibers.